Explanation: 69th Constitutional Amendment Act of 1991:

• 69 Amendment Constitutional Amendment Act of 1991 designated the Union Territory of Delhi as the National Capital Territory of Delhi.
• The 69th Amendment act of the Indian Constitution granted special status to Delhi in 1991. it was declared the National Capital Territory.
• It created a state assembly and council of ministers for the state.
• Aditya Nath Jha became the first Lieutenant Governor of Delhi under the act.
• Article 239AA of the Constitution gave the status of Union Territory to Delhi.

Source: Laxmikanth